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Cryptosporidium, a parasite, is another common cause of gastrointestinal illness, said Victoria Lynch, an environmental epidemiologist at the Columbia University Mailman School of Public Health.

Cecilia Sorensen, an associate professor of emergency medicine at Columbia University, talks about how kids, parents, and everyone else can protect themselves during the heat wave.

Joshua Willey, a stroke specialist at the Columbia University Vagelos College of Physicians and Surgeons, said the risk-benefit calculation would differ for each patient.